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Wyszukujesz frazę "Godlewski, D." wg kryterium: Autor

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    Wyświetlanie 1-14 z 14
    Tytuł:
    Enhanced Exciton-Phonon Interaction in Strained ZnCdSe/ZnSe Quantum Well Structures
    Autorzy:
    Godlewski, M.
    Leonardi, K.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968093.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    76.70.Hb
    Opis:
    Radiative recombination processes in pseudomorphic ZnCdSe/ZnSe structures are compared to those observed in strain-relaxed structures grown on GaAs substrates with thick ZnSe buffer layers. From the temperature dependence of the photoluminescence line width we evaluate the strength of exciton-phonon interaction with acoustic (dominant at lower temperatures) and optical phonons. Stronger exciton-phonon interaction is observed for pseudomorphic structures. Such enhanced exciton-phonon interaction is likely responsible for a faster photoluminescence deactivation at increased temperatures. We also report different exciton properties (photoluminescence intensity, width, strength of exciton-phonon interaction) in quantum well of a given width but in structures grown with different order of quantum wells. More stable photoluminescence (with increasing temperature) is observed for a given quantum well if it is closer to the buffer layer and not to the cap layer.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 769-773
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties of Molecular Beam Epitaxy Grown ZnSe on GaAs
    Autorzy:
    Karpińska, K.
    Suchocki, A.
    Godlewski, M.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929648.pdf
    Data publikacji:
    1993-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Bd
    68.55.Ln
    78.66.Fd
    Opis:
    Photoluminescence studies of molecular beam epitaxy grown ZnSe-on-GaAs layers are presented. The high sensitivity of the PL technique allowed for identification unintentional dopants in pure ZnSe sample. Characteristic photoluminescence lines due to extended defects were observed. The experimental results obtained show a correlation between intentional doping level and extended defects concentration. We conclude also that even though molecular beam epitaxy layers are grown at low temperature, the self-compensation mechanism may still be important. For heavily doped sample edge emission is deactivated likely due to efficient energy transfer link with deep donor-acceptor pair bands.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 3; 551-554
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Growth Conditions on Optical Properties of ZnCdSe/ZnSe Quantum Wells Grown by Molecular Beam Epitaxy
    Autorzy:
    Godlewski, M.
    Bergman, J. P.
    Monemar, B.
    Kurtz, E.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1950749.pdf
    Data publikacji:
    1996-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    71.35.+z
    76.70.Hb
    Opis:
    The results of investigations of photoluminescence, time-resolved photoluminescence, photoluminescence kinetics and their temperature dependencies are discussed for two types of ZnCdSe/ZnSe multi quantum well structures - for pseudomorphic and for strain relaxed structure. Densities of 2D localized states and averaged localization energies, as seen by excitons, are determined from the photoluminescence kinetics measurements. We show distinct differences between exciton properties in two multi quantum well structures studied.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 4; 785-788
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Characterization of CdZnSe/ZnSe Multiquantum Well System
    Autorzy:
    Godlewski, M.
    Karpińska, K.
    Bergman, J. P.
    Monemar, B.
    Kurtz, E.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932081.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    71.35.+z
    76.70.Hb
    Opis:
    Optical properties of Cd$\text{}_{x}$Zn$\text{}_{1-x}$Se/ZnSe (x = 0.12) multiquantum well system are discussed. The transient photoluminescence and optically detected cyclotron resonance experiments demonstrate a strong contribution of bound exciton emission to the low temperature photoluminescence spectra.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 209-212
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence and Chromaticity Properties of ZnO Nanopowders Made by a Microwave Hydrothermal Method
    Autorzy:
    Wolska, E.
    Sibera, D.
    Witkowski, B.
    Yatsunenko, S.
    Pełech, I.
    Narkiewicz, U.
    Godlewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492917.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.-n
    61.43.Gt
    81.07.Wx
    78.55.Et
    Opis:
    Four series of ZnO nanopowders obtained by a microwave hydrothermal method are examined. Two different solvents (ethanol and distilled water) and different values of pressure during heating in the reactor were used. The obtained nanopowders show a bright emission covering visible light spectral region, including the band edge emission. Results of scanning electron microscopy, X-ray diffraction, photo- and cathodoluminescence investigations and also CIE1961 chromaticity diagram are presented.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 908-910
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of n-ZnO/p-GaN Heterojunction for Optoelectronic Applications
    Autorzy:
    Wachnicki, L.
    Gieraltowska, S.
    Witkowski, B.
    Figge, S.
    Hommel, D.
    Guziewicz, E.
    Godlewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399138.pdf
    Data publikacji:
    2013-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.30.Kk
    61.05.cp
    81.05.Dz
    Opis:
    An important feature of zinc oxide and gallium nitride materials are their similar physical properties. This allows to use them as a p-n junction materials for applications in optoelectronics. In earlier work we presented use of ZnO as a transparent contact to GaN, which may improve external efficiency of LED devices. In this work we discuss properties of a n-ZnO/p-GaN heterostructure and discuss its optimization. The heterostructure is investigated by us for possible applications, e.g. in a new generation of UV LEDs or UV light detectors.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 5; 869-872
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Exciton Properties in Quantum Well Structures of ZnCdSe/ZnSe and ZnSe/ZnMgSSe
    Autorzy:
    Godlewski, M.
    Ivanov, V. Yu.
    Bergman, J. P.
    Monemar, B.
    Leonardi, K.
    Behringer, M.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1969074.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.-y
    73.20.Mf
    73.20.Dx
    Opis:
    Properties of excitons in quantum well structures of ZnCdSe/ZnSe and ZnSe/ZnMgSSe are compared. In ternary ZnCdSe quantum wells and at low temperature excitons are strongly localised. Weaker localization is observed in quantum well structures of ZnSe/ZnMgSSe. Present studies suggest formation of negatively charged excitons in the latter structures.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 313-316
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light Emission Properties of GaN-Based Laser Diode Structures
    Autorzy:
    Godlewski, M.
    Phillips, M. R.
    Czernecki, R.
    Targowski, G.
    Perlin, P.
    Leszczyński, M.
    Figge, S.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043715.pdf
    Data publikacji:
    2005-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.30.-z
    78.60.Hk
    68.37.Hk
    Opis:
    Cathodoluminescence is applied for evaluation of in-depth and in-plane variations of light emission from two types of GaN-based laser diode structures. We evaluate in-depth properties of the laser diode emission and demonstrate that potential fluctuations still affect emission of laser diodes for e-beam currents above thresholds for a stimulated emission.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 4; 675-680
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure Dependent Conductivity of Ultrathin ZnO Films
    Autorzy:
    Snigurenko, D.
    Kopalko, K.
    Krajewski, T.
    Łuka, G.
    Gierałtowska, S.
    Witkowski, B.
    Godlewski, M.
    Dybko, K.
    Paszkowicz, W.
    Guziewicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1403646.pdf
    Data publikacji:
    2012-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.Ga
    78.66.Hf
    81.15.Gh
    Opis:
    Zinc oxide films dedicated for hybrid organic/inorganic devices have been studied. The films were grown at low temperature (100°C, 130C and 200°C) required for deposition on thermally unstable organic substrates. ZnO layers were obtained in atomic layer deposition processes with very short purging times in order to shift a structure of the films from polycrystalline towards amorphous one. The correlation between atomic layer deposition growth parameters, a structural quality and electrical properties of ZnO films was determined.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 6; 1042-1044
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties and Characterization of ALD Grown Dielectric Oxides for MIS Structures
    Autorzy:
    Gierałtowska, S.
    Sztenkiel, D.
    Guziewicz, E.
    Godlewski, M.
    Łuka, G.
    Witkowski, B. S.
    Wachnicki, Ł.
    Łusakowska, E.
    Dietl, T.
    Sawicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048118.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Gh
    77.55.-g
    77.84.Bw
    81.05.Ea
    Opis:
    We report on an extensive structural and electrical characterization of undergate dielectric oxide insulators Al$\text{}_{2}$O$\text{}_{3}$ and HfO$\text{}_{2}$ grown by atomic layer deposition. We elaborate the atomic layer deposition growth window for these oxides, finding that the 40-100 nm thick layers of both oxides exhibit fine surface flatness and required amorphous structure. These layers constitute a base for further metallic gate evaporation to complete the metal-insulator-semiconductor structure. Our best devices survive energizing up to ≈ 3 MV/cm at 77 K with the leakage current staying below the state-of-the-art level of 1 nA. At these conditions the displaced charge corresponds to a change of the sheet carrier density of 3 × 10$\text{}^{13}$ cm$\text{}^{-2}$, which promises an effective modulation of the micromagnetic properties in diluted ferromagnetic semiconductors.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 692-695
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave-Induced Delocalization of Excitons in Ternary Compounds of II-VI and III-V Semiconductors
    Autorzy:
    Ivanov, V. Yu.
    Godlewski, M.
    Khachapuridze, A.
    Yatsunenko, S.
    Wojtowicz, T.
    Karczewski, G.
    Bergman, J. P.
    Monemar, B.
    Shamirzaev, T.
    Zhuravlev, K.
    Leonardi, K.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035757.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Ji
    72.25.Rb
    76.70.Hb
    78.55.Et
    Opis:
    In this work we employ technique of optically detected cyclotron resonance for evaluation of the role of localization processes in CdTe/CdMnTe and CdMnTe/CdMgTe quantum well structures. From microwave-induced changes of excitonic emissions we evaluate magnitude of potential fluctuations (Stokes shift), correlate optically detected cyclotron resonance results with the results of time-resolved experiments and discuss nature of recombination processes in the limit of a strong localization.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 559-566
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Epitaxial ZnO Films Grown at Low Temperature for Novel Electronic Application
    Autorzy:
    Wachnicki, Ł.
    Dużyńska, A.
    Domagala, J.
    Witkowski, B.
    Krajewski, T.
    Przeździecka, E.
    Guziewicz, M.
    Wierzbicka, A.
    Kopalko, K.
    Figge, S.
    Hommel, D.
    Godlewski, M.
    Guziewicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492723.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Aa
    61.05.cp
    81.05.Dz
    Opis:
    Monocrystalline films of zinc oxide were grown at 300C by atomic layer deposition. ZnO layers were grown on various substrates like ZnO bulk crystal, GaN, SiC and $Al_2O_3$. Electrical properties of the films depend on structural quality. Structural quality, surface morphology and optical properties of ZnO films were characterized using X-ray diffraction, scanning electron microscopy, and photoluminescence, respectively. High resolution X-ray diffraction spectra show that the rocking curve FWHM of the symmetrical 00.2 reflection equals to 0.058° and 0.009° for ZnO deposited on a gallium nitride template and a zinc oxide substrate, respectively. In low temperature photoluminescence sharp excitonic lines in the band-edge region with a FWHM equal to 4 meV, 5 meV and 6 meV, for zinc oxide deposited on gallium nitride, zinc oxide and sapphire substrate, respectively.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-007-A-010
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cathodoluminescence Profiling of InGaN-Based Quantum Well Structures and Laser Diodes - In-Plane Instabilities of Light Emission
    Autorzy:
    Godlewski, M.
    Ivanov, V. Yu.
    Goldys, E. M.
    Phillips, M.
    Böttcher, T.
    Figge, S.
    Hommel, D.
    Czernecki, R.
    Prystawko, P.
    Leszczynski, M.
    Perlin, P.
    Grzegory, I.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036870.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ff
    61.72.Mm
    68.37.Hk
    78.60.Hk
    Opis:
    Instabilities of light emission and also of stimulated emission in series of GaN epilayers and InGaN quantum well structures, including laser diode structures, are studied. A stimulated emission is observed under electron beam pumping. This enabled us to study light emission properties from laser structures and their relation to microstructure details. We demonstrate large in-plane fluctuations of light emission and that these fluctuations are also present for excitation densities larger than the threshold densities for the stimulated emission.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 689-694
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationship between Sample Morphology and Carrier Diffusion Length in GaN Thin Films
    Autorzy:
    Godlewski, M.
    Goldys, E. M.
    Phillips, M.
    Böttcher, T.
    Figge, S.
    Hommel, D.
    Czernecki, R.
    Prystawko, P.
    Leszczynski, M.
    Perlin, P.
    Wisniewski, P.
    Suski, T.
    Bockowski, M.
    Grzegory, I.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035593.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ff
    61.72.Mm
    68.37.Hk
    78.60.Hk
    Opis:
    Scanning and spot-mode cathodoluminescence investigations of homo- and hetero-epitaxial GaN films indicate a surprisingly small influence of their microstructure on overall intensity of a light emission. This we explain by a correlation between structural quality of these films and diffusion length of free carriers and excitons. Diffusion length increases with improving structural quality of the samples, which, in turn, enhances the rate of nonradiative recombination on structural defects, such as dislocations.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 627-632
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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